题目内容
先化简,再求值:
÷(x-
),其中 x=
-1.
| x2-2x |
| x |
| 4 |
| x |
| 2 |
原式=
÷
=
•
=
,
当x=
-1时,原式=
=3-2
.
| x(x-2) |
| x |
| x2-4 |
| x |
| x(x-2) |
| x |
| x |
| (x+2)(x-2) |
| x |
| x+2 |
当x=
| 2 |
| ||
|
| 2 |
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题目内容
| x2-2x |
| x |
| 4 |
| x |
| 2 |
| x(x-2) |
| x |
| x2-4 |
| x |
| x(x-2) |
| x |
| x |
| (x+2)(x-2) |
| x |
| x+2 |
| 2 |
| ||
|
| 2 |